三氟乙酸 → HCID 21191156，化合物
反应方程式
[CH3:1][O:2][C:3]([C:5]1[CH:6]=[C:7]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([O:17][CH2:18][CH2:19][NH:20]C(OC(C)(C)C)=O)[CH:12]=2)[CH:8]=[CH:9][CH:10]=1)=[O:4].FC(F)(F)C(O)=O>C(Cl)Cl>[CH3:1][O:2][C:3]([C:5]1[CH:6]=[C:7]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([O:17][CH2:18][CH2:19][NH2:20])[CH:12]=2)[CH:8]=[CH:9][CH:10]=1)=[O:4]参与物
4
实验过程
The methyl-3′-[2-[[(tert-butoxy)carbonyl]amino]ethoxy]-[1,1′-biphenyl]-3-carboxylate (659 mg) was dissolved in methylene chloride (25 mL) and trifluoroacetic acid (2.5 mL) was added. The mixture was stirred at room temperature for 6 h, additional trifluoroacetic acid (1.0 mL) was added and the mixture was stirred overnight. The mixture was concentrated and partitioned between saturated aqueous sodium bicarbonate and ethyl acetate. The organic layer was separated, dried over sodium sulfate, filtered and concentrated to give the crude product. This residue was partitioned between 1:1 hexane: ethyl acetate and 1 N aqueous HCl. The aqueous layer was separated, washed with 1:1 hexane: ethyl acetate and made basic by addition of solid sodium bicarbonate. The mixture was extracted twice with ethyl acetate, and the combined organic extracts were dried over sodium sulfate, filtered and concentrated to afford the title compound (474 mg) as a colorless oil. Electrospray MS (positive ion): (M+H) 272.0.